CA1192879A - Spiral scoop rotary plow feeder - Google Patents
Spiral scoop rotary plow feederInfo
- Publication number
- CA1192879A CA1192879A CA000408961A CA408961A CA1192879A CA 1192879 A CA1192879 A CA 1192879A CA 000408961 A CA000408961 A CA 000408961A CA 408961 A CA408961 A CA 408961A CA 1192879 A CA1192879 A CA 1192879A
- Authority
- CA
- Canada
- Prior art keywords
- scoop
- feed aperture
- container
- blade
- side wall
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G65/00—Loading or unloading
- B65G65/30—Methods or devices for filling or emptying bunkers, hoppers, tanks, or like containers, of interest apart from their use in particular chemical or physical processes or their application in particular machines, e.g. not covered by a single other subclass
- B65G65/34—Emptying devices
- B65G65/40—Devices for emptying otherwise than from the top
- B65G65/48—Devices for emptying otherwise than from the top using other rotating means, e.g. rotating pressure sluices in pneumatic systems
- B65G65/4809—Devices for emptying otherwise than from the top using other rotating means, e.g. rotating pressure sluices in pneumatic systems rotating about a substantially vertical axis
- B65G65/4836—Devices for emptying otherwise than from the top using other rotating means, e.g. rotating pressure sluices in pneumatic systems rotating about a substantially vertical axis and moving material over a stationary surface, e.g. sweep arms or wheels
Abstract
SPIRAL SCOOP ROTARY PLOW FEEDER
ABSTRACT OF THE DISCLOSURE
A rotary plow feeder for feeding granular material downwardly through a feed aperture in the bottom of a bin, hopper or other housing in the form of an annular stream comprises a rotary scoop disposed above and close to the feed aperture, the scoop including at least one plow blade continu-ously and gently curved in the form of a spiral and extending essentially around the whole periphery of the feed aperture and a cover or shroud disposed above and connected to the blade.
The outer end of the blade is disposed in contact with or close to the side wall of the housing, and the inner end of the blade is disposed adjacent the feed aperture at a distance therefrom suffi-cient to permit granular material to be moved into position around the entire periphery of the feed aperture.
ABSTRACT OF THE DISCLOSURE
A rotary plow feeder for feeding granular material downwardly through a feed aperture in the bottom of a bin, hopper or other housing in the form of an annular stream comprises a rotary scoop disposed above and close to the feed aperture, the scoop including at least one plow blade continu-ously and gently curved in the form of a spiral and extending essentially around the whole periphery of the feed aperture and a cover or shroud disposed above and connected to the blade.
The outer end of the blade is disposed in contact with or close to the side wall of the housing, and the inner end of the blade is disposed adjacent the feed aperture at a distance therefrom suffi-cient to permit granular material to be moved into position around the entire periphery of the feed aperture.
Description
3'7~:~
SPIRAL SCOOP ROTARY PLOW FEEDER
This invention relates to rotary plow feeders for feeding granular material downwardly, with gravity assist, through a feed aperture in the lower end of a bin, hopper or the likeO
BACKGRC)UND AND PRIOP~ ART
Ro~ary plow fee!ders of various designs have been in use for many year~. In general such feeders include a b.in, hopper or other container or granular material having a bottom wall provided with a central feed aperture and a rotary plow device located above the feed aperture and close to the bottom wall~ Rotatio~ of the plow device about the vertical axis of the feed aperture results in engagement of the granular material with the plow device which is shAp~
urye the granular material by a scooping action toward the feed aper~ure. The material is thus pushed over the edge of the ee~ aperture to fall : ~o by gravity from the container~
A search conducted with respect to the present development identified United States Patents 217,628t ~43,716, 371,881, 1,856,3Çl9 3,036,745 and 4,020,980, of which the first three were considered to be more relevant than the others.
SUMMA~Y OF THE INVENTION
The eeder of the present invention combines several features, particularly a specially sh~ped scoop, to provide efficient ~low o granular material uniformly and simultaneously over essentially the whole of the periphery of the feed aperture during rotation of the plow blade.
By simultaneously i5 meant that material flows S over esentially all of the periphery of the aperture at any given time ln ~he form of an annular stream, rather than over only a portion of the periphery. The characteristics of uniform flow and annular flow res,ult in large measure ~rom the use oE a plow blade which is continuously curved in spiral form along a path of e~sentially 360 so that it essentially completely surrounds the feed aperture. A cover plate or shroud plate overlies and is ~onnected to the plow blade so that a scoop cavity is formed by the plate, the blade and the bottom of the container.
Rotary movement of the scoop about the axis of the spiral, which coincides with the axis of the feed aperture, eauses granular material ~o flow smoothly between the end portions of the plow blade into the scoop ca~ity. The operation is efficient in that there is little or no pushing or material ahead of the scoop with consequent generation o friction forces which do not contribute to the feeding operation. Rather, the material once in the scoop cavity is gradually pushed inwardly toward the feed aperture along essentially the entire periphexy~ with the resulting friction forces contributing directly to the feeding operation.
It is important that during feeding the directiQn o movement o~ the bulk ma~erial not be changed abruptly7 as this tends to produce the absve-mentioned pilshing of material ahead of the scoop, ire~ backsliding of the material in the 7~
direct.ion of rotation of the scoop and consequent reduced effi~iency. Therefore, the plow blade should not be sharply curved as is typical o~
prior art plow feeders, such as those described in~ 3 patents 217,628, 243t716 and 371,881. The curved plow blades describçd in ~hose patents are essen-tially circular over a ~ubstantial portion o~
their length; even thouyh the outer end portions of those blades may be spirally curved the pakh followed by granular material will change direetion rather abruptly with the result that backslid.ing will occur and a significant amount of material will be pushed around in a circle in the lower end of the Eeeder housing instead of being plowed radially toward the discharge opening, Backsliding is avoided in the present invention by a combination of features including the curvature of the plow blade, the si2e of 'che feed aperture relatiYe to the largest hori~on~i dimension of the scoop, the dis~osition of the plow blade relative to the feed aperture and the relationship between the largest horizontal dimension of the scoop to the diameter of the housinq at the location of ~he scoop entry, The preferred curvature of the plow blade i~l as previouSly mentioned, a continuous gentle spiral from one end to the other~ Tangents drawn at right angles to radil of the spiral at the plow blade should lie outside the plow blade rather than insideJ because when the former feature is p~esent the curvature of the blade is suffic;ently gradual to produ~e the desired feeding action.
suitable curvature for the plow blade is an involute curve. The size of the feed aperture shoul~d be ~mall enough relative to the largest ~ 7l~
horizontal dimension of the scoop to provide a space between the inner end portion of the blade and the ~eed aperture~ The horizontal dimension of the space should be suf f icient to allow the granular material to be moved into that space and then uniformly over the edge of the feed aperture adjacent the inner end portion of the blade~ If the eed ape~ture is ~oo large (or if the scoop is too small) the material will be pushed over the edge o~ the feed aperture beEore it reaches the inner end of the blade, and an annular discharge stream will no~ be produced. Bulk material on the inner shelf als~ acts as a seal to prevent flush-ing of powder materials in certain applicatings when bulk materials are aerated.
When the above relationships are present, the horizontal dimension of the scoop will inherently be a substantial pro~ortion oE t~le horizontal dimension of the feeder housing at the location of the scoop. For many feeding opera-tions the outer end of ~he SCQOp should be in sliding rontact with the side wall o~ the housing to pevent jamming of material between the housing and the scoop entry. This sliding contact can be
SPIRAL SCOOP ROTARY PLOW FEEDER
This invention relates to rotary plow feeders for feeding granular material downwardly, with gravity assist, through a feed aperture in the lower end of a bin, hopper or the likeO
BACKGRC)UND AND PRIOP~ ART
Ro~ary plow fee!ders of various designs have been in use for many year~. In general such feeders include a b.in, hopper or other container or granular material having a bottom wall provided with a central feed aperture and a rotary plow device located above the feed aperture and close to the bottom wall~ Rotatio~ of the plow device about the vertical axis of the feed aperture results in engagement of the granular material with the plow device which is shAp~
urye the granular material by a scooping action toward the feed aper~ure. The material is thus pushed over the edge of the ee~ aperture to fall : ~o by gravity from the container~
A search conducted with respect to the present development identified United States Patents 217,628t ~43,716, 371,881, 1,856,3Çl9 3,036,745 and 4,020,980, of which the first three were considered to be more relevant than the others.
SUMMA~Y OF THE INVENTION
The eeder of the present invention combines several features, particularly a specially sh~ped scoop, to provide efficient ~low o granular material uniformly and simultaneously over essentially the whole of the periphery of the feed aperture during rotation of the plow blade.
By simultaneously i5 meant that material flows S over esentially all of the periphery of the aperture at any given time ln ~he form of an annular stream, rather than over only a portion of the periphery. The characteristics of uniform flow and annular flow res,ult in large measure ~rom the use oE a plow blade which is continuously curved in spiral form along a path of e~sentially 360 so that it essentially completely surrounds the feed aperture. A cover plate or shroud plate overlies and is ~onnected to the plow blade so that a scoop cavity is formed by the plate, the blade and the bottom of the container.
Rotary movement of the scoop about the axis of the spiral, which coincides with the axis of the feed aperture, eauses granular material ~o flow smoothly between the end portions of the plow blade into the scoop ca~ity. The operation is efficient in that there is little or no pushing or material ahead of the scoop with consequent generation o friction forces which do not contribute to the feeding operation. Rather, the material once in the scoop cavity is gradually pushed inwardly toward the feed aperture along essentially the entire periphexy~ with the resulting friction forces contributing directly to the feeding operation.
It is important that during feeding the directiQn o movement o~ the bulk ma~erial not be changed abruptly7 as this tends to produce the absve-mentioned pilshing of material ahead of the scoop, ire~ backsliding of the material in the 7~
direct.ion of rotation of the scoop and consequent reduced effi~iency. Therefore, the plow blade should not be sharply curved as is typical o~
prior art plow feeders, such as those described in~ 3 patents 217,628, 243t716 and 371,881. The curved plow blades describçd in ~hose patents are essen-tially circular over a ~ubstantial portion o~
their length; even thouyh the outer end portions of those blades may be spirally curved the pakh followed by granular material will change direetion rather abruptly with the result that backslid.ing will occur and a significant amount of material will be pushed around in a circle in the lower end of the Eeeder housing instead of being plowed radially toward the discharge opening, Backsliding is avoided in the present invention by a combination of features including the curvature of the plow blade, the si2e of 'che feed aperture relatiYe to the largest hori~on~i dimension of the scoop, the dis~osition of the plow blade relative to the feed aperture and the relationship between the largest horizontal dimension of the scoop to the diameter of the housinq at the location of ~he scoop entry, The preferred curvature of the plow blade i~l as previouSly mentioned, a continuous gentle spiral from one end to the other~ Tangents drawn at right angles to radil of the spiral at the plow blade should lie outside the plow blade rather than insideJ because when the former feature is p~esent the curvature of the blade is suffic;ently gradual to produ~e the desired feeding action.
suitable curvature for the plow blade is an involute curve. The size of the feed aperture shoul~d be ~mall enough relative to the largest ~ 7l~
horizontal dimension of the scoop to provide a space between the inner end portion of the blade and the ~eed aperture~ The horizontal dimension of the space should be suf f icient to allow the granular material to be moved into that space and then uniformly over the edge of the feed aperture adjacent the inner end portion of the blade~ If the eed ape~ture is ~oo large (or if the scoop is too small) the material will be pushed over the edge o~ the feed aperture beEore it reaches the inner end of the blade, and an annular discharge stream will no~ be produced. Bulk material on the inner shelf als~ acts as a seal to prevent flush-ing of powder materials in certain applicatings when bulk materials are aerated.
When the above relationships are present, the horizontal dimension of the scoop will inherently be a substantial pro~ortion oE t~le horizontal dimension of the feeder housing at the location of the scoop. For many feeding opera-tions the outer end of ~he SCQOp should be in sliding rontact with the side wall o~ the housing to pevent jamming of material between the housing and the scoop entry. This sliding contact can be
2$ e~fected by providing a resilient outer end portion on the plow blade.
It is important that the scoop include a cover or shroud plate that rotates with the bladeO
The resulting scoop cavity, having a closed top, performs a two-stage operation. First, the scoop cuts through the granular material to envelop and shroucl a mass of the material and to separate the mass from the bulk material in the housing without pushirlg any of the bulk material ahead of the scoop... Second, the separated mass is gradually
It is important that the scoop include a cover or shroud plate that rotates with the bladeO
The resulting scoop cavity, having a closed top, performs a two-stage operation. First, the scoop cuts through the granular material to envelop and shroucl a mass of the material and to separate the mass from the bulk material in the housing without pushirlg any of the bulk material ahead of the scoop... Second, the separated mass is gradually
3~7~:~
plowed toward the whole of the periphery of the feed aperture. Equally important is the agitating effect of the rotary scoop which prevents arching of granular material above ~he rotary scoop area.
Arching should be avoided hecause when present it interrupts the feeding operation.
BRIEF DESCRIPTION OF TRE DRAWING~
FIGURE 1 is an elevational view, partly broken away, of a feeder embodying the principles Of the present inven~ion;
FIGUR~ ~ is a horizontal sectional view~
on an enlarged scale~ taken on the line 2 2 of FIGURE l;
FIGURE 3 is a fragmentary sectional view taken on the line 3-3 of FIGUR~ 2; and FIGURE 4 is a fragmentary sectional view taken on the line 4~4 of FIGURE 2.
DETAILED DESCRIPTION
FIGURE 1 illustrates a bin, hopper or other container having at its lower end a cylin~
drical feeder housing side wall 10 and a bottom wall 12 provided with a central circular feed aperture 140 A rotary scoop 16 embodying the principles of the invention is supported above the feed aperture 14 by a drive shaft 18 which is coaxial with the axis of scoop 16 and the feed aperture 14. The shaft 18 is rotatably driven by ~ motor 20 which may be located either above the scoop 16, as shown, or below the bottom wall 12.
The scoop 16 includes a curved plow blade 22 and a cover or shroud plate 23 fixed to the upper edge of the blade 22 50 as to rotate therewith. ~he bla~e 22 is spirally curved along its entire length, the spiral being a gradual one such that tangents at right angles to radii lie essentially outside the periphery of the scoop as shown at T1, T2, T3, etc~ in FIGURE 2. The illustra~ed curvature is similar to an involute curve~ The blade 22 should extend completely around t.he feed aperture 14; in the illustrated embodiment the blade 22 extends somewhat more than 360. The inn~rmo~t end 24 of the ~lade 22 terminates quit~ close to the periphery of the feed aperture 14 and at the same time there is a space 26 between the blade 22 and the periphery located at 36Q or more (beginning at the outer end 28 of the blade 223 50 that granular material can surround the apeEture 14 before being plo~!e~.
~o over the edge of the aperture 14.
To prevent flushing of particularly pourable granular material through the mouth ~0 of the scoop 16 and through the feed aperture 14 the innermost end of the plow blade can be extended spirally somewhat further than is necessary for plowing, and this end can be sloped to provide an edge 32 which faces upwardly and in the direction o~ rotation of the plow 16.
To prevent jamming of certain kinds of granular material ~e~ween the outer leading end of the plow blade 22, this outer end may be disposed in sl.iding contact with the housing side wall 10, A particularly suitable arrangement is one ;n which l:he outer end is res;lient and biased toward th~ wall 10. This can be accomplished by having ~ '7~
the outer end portion 34 of the blade separate from the remainder of the blade 22 and by attach-ing the end portion 34 to the remainder by means of a flat spring ste~l plate 36 riveted to both parts. llhe thus resiliently mounted end portion 34 may pro~ect beyond the shroud 23 in the direc-tion of scoop rotation as shown in FIGURE 2.
In operation of the feeder the scoop 16 is rotated counterclockwise about the axis of the spiral plow blade 22. Granular material in the feeder housing is enveloped by the mouth 30 of the SCOQp 16 and i5 eased gradually to the entire periphery of the feed aperture 14. The tangential force components at the tangents Tl~ T2, etc. on the periphery of the blade lie outside that periphery and this indicates a low sllding force along the blade 22~ Therefore, the flow o material is smooth, without backsliding in the direction of scoop rotation, because the material o is being enveloped in a gradual sweeping motion and gradually moves toward the feed aperture along the whole periphery thereof. More speciically, there is rel atively high fric:tion between the granular material and the bott:om wall and at any given point along the hlade 22 there is relatively low friction between that point and the granular material. The high essentlally static bottom-wall friction i5 sufficient to overcome the lower sliding friction at the concave surface of the 3Q blade9 and as a result there is no tendency for the sweeping action of the blade 22 ~o move any of the material in the direction of scoop rotation.
That is, the only movement of the material is inwardly toward the feed aperture 14. Consider~
for ex~nple, the conditions at start-up, with an ~ 7~
empty scoop cavity within the scoop 16 and with the scoop 16 ernbedded in the stationary bulk material in the housing. Upon counterclockwise rotation of the scoop 16~, the mouth 30 o~ the latter cuts into the stationary material without causing any movement of the material in the direction of scoop rotat:ion. The first material to be contacted by ~he co~cave surface of the blade ~2 will begin to be urged radially inwardly la and some of this materia:L will. be pushed over the edge of the eed aperture 14 beginning at the inn*r end o$ the blade~ irea abou~ 11 o'clock in FIGURE 2. ~owever, as the spiral curvature o the blade 22 is gradual the scoop will rotate approxi-mately 360 without discharging all of the initially enveloped material. That is, at the end of the f irst revolution of the scoop 16 there will be a mass of granular material disposed along the entire periphery of the feed aperture, including the space adjacent the inner end 24 of the blade 22, this mass of material having been moved radially by the blade but not moved in the direc-tion of blade rotation. At the beginning of the second revolution of the ~oop 16, and thereafter, granular material will be pushed over the entire periphery of the feed aperture continuously and uniformly, thereby forming a uniform downwardly flowing annular stream.
plowed toward the whole of the periphery of the feed aperture. Equally important is the agitating effect of the rotary scoop which prevents arching of granular material above ~he rotary scoop area.
Arching should be avoided hecause when present it interrupts the feeding operation.
BRIEF DESCRIPTION OF TRE DRAWING~
FIGURE 1 is an elevational view, partly broken away, of a feeder embodying the principles Of the present inven~ion;
FIGUR~ ~ is a horizontal sectional view~
on an enlarged scale~ taken on the line 2 2 of FIGURE l;
FIGURE 3 is a fragmentary sectional view taken on the line 3-3 of FIGUR~ 2; and FIGURE 4 is a fragmentary sectional view taken on the line 4~4 of FIGURE 2.
DETAILED DESCRIPTION
FIGURE 1 illustrates a bin, hopper or other container having at its lower end a cylin~
drical feeder housing side wall 10 and a bottom wall 12 provided with a central circular feed aperture 140 A rotary scoop 16 embodying the principles of the invention is supported above the feed aperture 14 by a drive shaft 18 which is coaxial with the axis of scoop 16 and the feed aperture 14. The shaft 18 is rotatably driven by ~ motor 20 which may be located either above the scoop 16, as shown, or below the bottom wall 12.
The scoop 16 includes a curved plow blade 22 and a cover or shroud plate 23 fixed to the upper edge of the blade 22 50 as to rotate therewith. ~he bla~e 22 is spirally curved along its entire length, the spiral being a gradual one such that tangents at right angles to radii lie essentially outside the periphery of the scoop as shown at T1, T2, T3, etc~ in FIGURE 2. The illustra~ed curvature is similar to an involute curve~ The blade 22 should extend completely around t.he feed aperture 14; in the illustrated embodiment the blade 22 extends somewhat more than 360. The inn~rmo~t end 24 of the ~lade 22 terminates quit~ close to the periphery of the feed aperture 14 and at the same time there is a space 26 between the blade 22 and the periphery located at 36Q or more (beginning at the outer end 28 of the blade 223 50 that granular material can surround the apeEture 14 before being plo~!e~.
~o over the edge of the aperture 14.
To prevent flushing of particularly pourable granular material through the mouth ~0 of the scoop 16 and through the feed aperture 14 the innermost end of the plow blade can be extended spirally somewhat further than is necessary for plowing, and this end can be sloped to provide an edge 32 which faces upwardly and in the direction o~ rotation of the plow 16.
To prevent jamming of certain kinds of granular material ~e~ween the outer leading end of the plow blade 22, this outer end may be disposed in sl.iding contact with the housing side wall 10, A particularly suitable arrangement is one ;n which l:he outer end is res;lient and biased toward th~ wall 10. This can be accomplished by having ~ '7~
the outer end portion 34 of the blade separate from the remainder of the blade 22 and by attach-ing the end portion 34 to the remainder by means of a flat spring ste~l plate 36 riveted to both parts. llhe thus resiliently mounted end portion 34 may pro~ect beyond the shroud 23 in the direc-tion of scoop rotation as shown in FIGURE 2.
In operation of the feeder the scoop 16 is rotated counterclockwise about the axis of the spiral plow blade 22. Granular material in the feeder housing is enveloped by the mouth 30 of the SCOQp 16 and i5 eased gradually to the entire periphery of the feed aperture 14. The tangential force components at the tangents Tl~ T2, etc. on the periphery of the blade lie outside that periphery and this indicates a low sllding force along the blade 22~ Therefore, the flow o material is smooth, without backsliding in the direction of scoop rotation, because the material o is being enveloped in a gradual sweeping motion and gradually moves toward the feed aperture along the whole periphery thereof. More speciically, there is rel atively high fric:tion between the granular material and the bott:om wall and at any given point along the hlade 22 there is relatively low friction between that point and the granular material. The high essentlally static bottom-wall friction i5 sufficient to overcome the lower sliding friction at the concave surface of the 3Q blade9 and as a result there is no tendency for the sweeping action of the blade 22 ~o move any of the material in the direction of scoop rotation.
That is, the only movement of the material is inwardly toward the feed aperture 14. Consider~
for ex~nple, the conditions at start-up, with an ~ 7~
empty scoop cavity within the scoop 16 and with the scoop 16 ernbedded in the stationary bulk material in the housing. Upon counterclockwise rotation of the scoop 16~, the mouth 30 o~ the latter cuts into the stationary material without causing any movement of the material in the direction of scoop rotat:ion. The first material to be contacted by ~he co~cave surface of the blade ~2 will begin to be urged radially inwardly la and some of this materia:L will. be pushed over the edge of the eed aperture 14 beginning at the inn*r end o$ the blade~ irea abou~ 11 o'clock in FIGURE 2. ~owever, as the spiral curvature o the blade 22 is gradual the scoop will rotate approxi-mately 360 without discharging all of the initially enveloped material. That is, at the end of the f irst revolution of the scoop 16 there will be a mass of granular material disposed along the entire periphery of the feed aperture, including the space adjacent the inner end 24 of the blade 22, this mass of material having been moved radially by the blade but not moved in the direc-tion of blade rotation. At the beginning of the second revolution of the ~oop 16, and thereafter, granular material will be pushed over the entire periphery of the feed aperture continuously and uniformly, thereby forming a uniform downwardly flowing annular stream.
Claims (5)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A rotary plow feeder for feeding granular material downwardly with gravity assist through a feed aperture in the bottom wall of a container having a generally circular side wall adjacent the bottom, the feeder comprising: a rotary scoop disposed above and close to the aperture, the scoop including a plow blade which is continuously curved in a generally spiral path along essentially its entire length about an axis coinciding with the axis of the aperture and which extends essentially around the whole of the periphery of the aperture, the outer end of the plow blade being disposed close to the container side wall and the inner end of the plow blade being disposed adjacent the aperture; and a shroud plate overlying and connected to the plow blade so that the shroud plate, plow blade and container bottom form a scooping cavity into which granular material flows from the container along a path located between the end portions of the plow blade and from which granular material flows uniformly and simultaneously over essentially the whole of the periphery of the feed aperture in the form of an annular stream during rotation of the scoop about the axis of the spiral.
2. A rotary plow feeder as in claim 1 wherein the outer end of the plow blade is in sliding contact with the side wall of the container.
3. A rotary plow feeder as in claim 2 wherein the outer end portion of the plow blade is resilient and is biased toward the side wall of the container.
4. A rotary plow feeder as in claim 1, 2 or 3 wherein the inner end of the plow blade has an edge which is inclined upwardly and in the direction of travel of the blade.
5. Apparatus for feeding granular material comprising: a container for holding the granular material, said container having a generally circular side wall and a bottom wall which has a feed aperture therethrough; and a rotary scoop disposed above and close to said feed aperture, said scoop having a top wall, an open bottom and a side wall which together with said bottom wall of said container form a cavity which is in communication with said feed aperture around the entire periphery thereof, said scoop side wall being curved in a generally spiral path along essentially its entire length about an axis coinciding with the axis of the feed aperture and which extends essentially around the whole of the periphery of the feed aperture, said side wall having an outer end disposed close to the container side wall and an inner end disposed adjacent but spaced from said feed aperture, the arrangement being such that, during rotation of said scoop about the axis of the spiral, granular material is urged by said scoop side wall in a radially inward direction but is not moved in the direction of scoop rotation whereby the granular material flows from the container uniformly and simultaneously over essentially the whole of the peripheral edge of said feed aperture in the form of an annular stream.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/291,765 US4411377A (en) | 1981-08-10 | 1981-08-10 | Spiral scoop rotary plow feeder |
| US291,765 | 1981-08-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1192879A true CA1192879A (en) | 1985-09-03 |
Family
ID=23121730
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000408961A Expired CA1192879A (en) | 1981-08-10 | 1982-08-06 | Spiral scoop rotary plow feeder |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US4411377A (en) |
| EP (1) | EP0085711B1 (en) |
| JP (1) | JPS58501224A (en) |
| AU (1) | AU553774B2 (en) |
| BR (1) | BR8207819A (en) |
| CA (1) | CA1192879A (en) |
| DE (1) | DE3274637D1 (en) |
| MX (1) | MX159187A (en) |
| WO (1) | WO1983000480A1 (en) |
| ZA (1) | ZA825739B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5242667A (en) * | 1991-07-26 | 1993-09-07 | Ferrofluidics Corporation | Solid pellet feeder for controlled melt replenishment in continuous crystal growing process |
| GB2284363A (en) * | 1993-12-02 | 1995-06-07 | Finnfeeds Int Ltd | Spraying apparatus |
| JP5171213B2 (en) * | 2007-11-05 | 2013-03-27 | 富士夫 堀 | Powder and particle feeder |
| US11122724B1 (en) | 2020-03-09 | 2021-09-21 | Joshua Zulu | Ground engaging tiller with involute profile |
| CN114348687B (en) * | 2022-02-17 | 2023-12-01 | 广东韶钢松山股份有限公司 | Disc feeder |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2530181A (en) * | 1947-07-29 | 1950-11-14 | Nichols Eng & Res Corp | Separating apparatus |
| US2814399A (en) * | 1955-09-28 | 1957-11-26 | Dow Chemical Co | Rotary scoop feeder |
| US2981522A (en) * | 1959-03-02 | 1961-04-25 | George F Spragens | Continuous mixing apparatus |
-
1981
- 1981-08-10 US US06/291,765 patent/US4411377A/en not_active Expired - Fee Related
-
1982
- 1982-08-06 CA CA000408961A patent/CA1192879A/en not_active Expired
- 1982-08-09 ZA ZA825739A patent/ZA825739B/en unknown
- 1982-08-09 MX MX193945A patent/MX159187A/en unknown
- 1982-08-10 BR BR8207819A patent/BR8207819A/en not_active IP Right Cessation
- 1982-08-10 JP JP57502749A patent/JPS58501224A/en active Pending
- 1982-08-10 EP EP82902791A patent/EP0085711B1/en not_active Expired
- 1982-08-10 DE DE8282902791T patent/DE3274637D1/en not_active Expired
- 1982-08-10 WO PCT/US1982/001083 patent/WO1983000480A1/en active IP Right Grant
- 1982-08-10 AU AU89089/82A patent/AU553774B2/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| AU553774B2 (en) | 1986-07-24 |
| EP0085711A4 (en) | 1984-01-10 |
| EP0085711B1 (en) | 1986-12-10 |
| WO1983000480A1 (en) | 1983-02-17 |
| DE3274637D1 (en) | 1987-01-22 |
| BR8207819A (en) | 1983-07-19 |
| JPS58501224A (en) | 1983-07-28 |
| AU8908982A (en) | 1983-02-22 |
| MX159187A (en) | 1989-04-28 |
| EP0085711A1 (en) | 1983-08-17 |
| ZA825739B (en) | 1983-07-27 |
| US4411377A (en) | 1983-10-25 |
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